// Set the smoothing mode to SmoothingModeHighSpeed, and fill an ellipse.
graphics.SetSmoothingMode(SmoothingModeHighSpeed);
graphics.FillEllipse(&SolidBrush(Color(255, 0, 0, 0)), 0, 200, 200, 100);
// 画椭圆的确变平滑了
// Set the smoothing mode to SmoothingModeHighQuality, and fill an ellipse.
graphics.SetSmoothingMode(SmoothingModeHighQuality);
graphics.FillEllipse(&SolidBrush(Color(255, 0, 0, 0)), 200, 200, 200, 100);